Travelers need to stay off Straight Slough, which flows into the main Kuskokwim River near Bethel.
Amazing footage shows the bears just 150 metres from the nearest house as shooting is criticised - but does little to deter predators.
Warm weather has made for unsafe traveling conditions, including a snowmachine race.
Blizzard conditions paralyzed Saskatoon and many other communities Wednesday as a fierce storm scoured the central part of the province, closing roads, airports and schools.
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